How to use Lerp?

Hello,

I make a platformer game. the camera follows the player in the X axis with a little offset of 7 units. I made a script to change this offset accordingly to the direction the player is moving. How can I smooth the transition between the two positions of the camera??

Circle = camera

Polygon = Player

 #pragma strict
 var player : Transform;
 var reverse : boolean;
 
 function Update () {
     if(!reverse)
     {
         transform.position.x = player.position.x + 7;
     }
     else
     {
         transform.position.x = player.position.x -7;
     }
 }